William   donaldson



(No Model.)

W. DONALDSON,

PUMP :AOTUATBD BY FLUID PRESSURE.

Patented Mar. 26, 1889.

N mans. Plwio-Lllhogmphur. Wahlngwn. n.c.

may be of any known kind.

UNITED STATES ATENT OFFICE.

MIDDLESEX,

PUMP ACTUATED BY FLUID-PRESSURE.

SPECIFIGA'LION forming part of Letters Patent D Io. 100,196, dated March 26, 1889.

Application filed November 15, 1888. Serial No. 290,961. (No model.) Patented inEngland June 19, 1886, No. 8,165, and in India October 17/24:, 1887, No. ISO/1,362.

T 0 all whom it may concern.-

Be it known that I, WILLIAM DONALDSON, a citizen of England, residing at 2 Vestminster Chambers, IVestminster, in the county of Middlesex, England, have invented new and useful Improvements in Pumps Actuated by Fluid-Pressure, (for which I have obtained patents in Great Britain, dated June 19, 1886, No. 8,165, and India, dated October 17 /24, 1887, Nos. 130/1,362, of 1887,) of which the following is a specification. 1

My invention relates to that description of pumping machinery in which a liquid or gaseous fluid under pressure is employed as the motive fluid for working the pump. The chief object which I have in view is by a simple and compact construction to insure the reciprocation of the pump by the automatic action of a slide-valve worked by the pressure of the motive fluid. I will describe the construction which I employ, referring to the accompanying drawings.

Figure 1 is a vertical section. Fig. 2 is a sectional plan 011 X X. Fig. 3 is an elevation of the valve-box; and Fig. 4 is an elevation of the workingplunger, showing the ports for effecting reciprocation of the slide-valve.

A is the pump, having a plunger, B, which is caused to rise by counter-weights O, at tached to it by chains passing over pulleys D. I have not shown in Fig. 1 the suction and delivery valves of the pump, as these On a framing, E, above the pump is fixed the power-cylinder F, having its axis in line with that of the pump A, and having its plunger G butting on the top of the pumpplunger B. At the side of the power-cylinder F is fixed the Valve-box H, in a cylindrical bore of which is fitted to slide to and fro a plunger, h, havingin its middle a circular groove, h. Through the valve-box there are two passages, K, by which the working-fluid is admitted, and L, by which the fluid is discharged after performing work in the power-cylinder F. hen the plunger h is moved to the one end of the valve-box H, the groove h gives free passage for fluid from the inlet K to the cylinder F, and when h is moved to the other end of the valve-box the groove h gives free passage for fluid from the cylinder F to the outlet L. The movement of the plunger h from the one end to the other is automatically effected in the following manner: In the body of the valve-box H are formed passages to four ports in the face of the valve-box presented toward the cylinder F-namely, a passage, M, from one end of the valve-box to a port, m; similarly a passage, N, from the other end of the valve-box to a port, 07; a passage, P, from the supply-inlet K to a port, 1), and a passage, R, from the out-let L to a port, 0". The three ports m, n, and 19 are on the same level, 1) being in the middle, and the port ris vertically above p. The plunger G, which works in the cylinder F, has formed in its face, which is presented toward the valve-box H, two sets of recessed passages, s t and s t, at two different heights, the one set being above the other by a distance equivalent to the stroke of the plunger. hen the plunger is at the lowest extreme of its stroke, the upper set of recesses, s t, presenting themselves toward the ports on n p '1', put m in communication with p and n with 0*. Thus by the passage M the working-fluid under pressure is admitted to act at one end of the bore of the valve-box, and fluid is allowed to escape by the passage N from the other end of the bore. The pressure acting on the slide-plunger h moves it from the one end of the bore to the other, bringing the groove h in line with the outlet L. The fluid above the plunger G is thus allowed to escape by L, as the plunger G is raised along with the plunger B by the descent of the counter-weights C. When the plunger G is thus raised throughout its full stroke, the lower set of its recessed passages, s t, is presented toward the ports on n p r of the valve-box II, and the slide-plunger h is thus moved back to the other end of the bore, bringing its groove 77. in line with the supplyinlet K. Working-fluid now entering the cylinder F forces down the plunger G until its upper recesses, s t, again present themselves to the ports of the valve-box, when the action described above is repeated.

Although I have shown the pump arranged with its axis vertical, it might obviously be horizontal, inclined, or inverted, the balanceweights being suitably arranged to efii'ect the back-stroke.

Having thus described the nature of my invention and the best means I know of car rying it out in practice, I claim- 1. In a pump actuated by fluid-pressure, the combination of the pump-cylinder A, its plunger B, the power-cylinder F and its plunger G, butting on B, the counterveights C and the guide-pulleys and the chains attached to the plunger 13, and the valve-box H, arranged to alternate the supply and discharge of the WOrkingfiuid, substantially as described.

In a pump actuated by fluid-pressure, the valve-box 11, having slide-plunger 71, with groove 7:, the passages M N P R and their WILLIAM DONALDSON.

Vitn esses:

OLIVER IMRAY, PatentAg ent, 28 Southmnpton B 11 [id in gs, Low

(Zen, TV. 0.

J NO. P. M. MILLARD, Ole-r7- 250 M'essrs. Abel d1" Imrcty Consulting Engineers and Patent Agents, 28 South mnpton Buildings, London. W. (I. 

